In 2012, according to government surveys, about what percentage of the U.S. population aged twelve and older had used marijuana or hashish at least once in the past thirty days?

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In 2012, government surveys indicated that approximately 9% of the U.S. population aged twelve and older had used marijuana or hashish at least once in the past thirty days.

In 2012, According to Government Surveys, About What Percentage of the U.S